... Usually described in millimeterUsage: This kinds of steel bar mainly take drawing stress together with ... Co., Ltd. (our head office), Tianjin Ruihe Steel Trade Co., Ltd., Tangshan Ruiyin International Trade Co., Ltd., Tianjin Guoshengtai logistics Co., Ltd. and Tianjin Weishihengxin Steel Co., Ltd. ... ore powder, coke, coal, billet steel, strip steel, section steel, steel plate, screws and all kinds of ...